A Long-Haul Rig is a type of SEMI-truck that is used for long-distance hauling. It is typically used to transport goods over long distances, such as across states or even countries. The term 'Long-Haul Rig' is derived from the fact that these trucks are designed to travel long distances and are equipped with features that make them suitable for this purpose. The term 'SEMI' is an acronym for 'SEMI-trailer truck, ' which is the type of vehicle used for long-haul rigs.